Rhizobium radiobacter is a gram negative bacillus that is infrequently recognized in clinical specimens but is emerging as an opportunistic human pathogen. Infections due to Rhizobium radiobacter are strongly related to the presence of foreign plastic material and effective treatment often requires removal of the device. We report a case of R. radiobacter bloodstream infection associated with a central venous catheter which was easily controlled by antimicrobial treatment and did not require removal of intravascular device. To the best of our knowledge, this is the first case report from India implicating R. radiobacter as a cause of human infection.

41.8%), and ceftazidime (36%). Interestingly, 43 (30.5%) (E coli -18, K pneumonia -8, E aerogenes -8, P aeruginosa -6, Pseudomonas spp. -3) of the 141 MBL producers were sensitive to both imipenem and meropenem by the CLSI DDST, with zone sizes of 16-21 mm. Of the 338 isolates, 80 (23.7%) produced all three of the newer β-lactamases [ Table 1]. In vitro resistance to amikacin, gentamicin, and ciprofl oxacin was signifi cantly higher (P < .05) in isolates producing all three newer β-lactamases compared to the rest (68.5%, 97.3%, and 83.6% vs 50.8%, 59.8% ,and 52.5%, respectively). References1. Gupta V. An update on newer beta-lactamases. Indian J Med Res 2007;126:417-27. 2. Performance Standards for Antimicrobial Susceptibility Testing; 17th informational supplement, Clinical and Laboratory Standards Institute (CLSI) M100-S17: Vol. 27, 17 th ed. Clinical and Laboratory Standards Institute, Wayne, PA; 2007. p. 3. 3. Paterson DL, Bonomo RA. Extended-spectrum β-lactamases: A clinical update. Clin Microbiol Rev 2005;18:657-86. 4. Black JA, Thomson KS, Buynak JD, Pitout JD. Evaluation of β-lactamase inhibitors in disk tests for detection of plasmidmediated AmpC β-lactamases in well-characterized clinical strains of Klebsiella spp. J Clin Microbiol 2005;43:4168-71. 5. Behera B, Mathur P, Das A, Kapil A, Sharma V. An evaluation of four different phenotypic techniques for detection of metallo-β-lactamase producing Pseudomonas aeruginosa. Indian J Med Microbiol 2008;26:233-7. 6. Marchiaro P, Mussi MA, Ballerini V, Pasteran F, Viale AM, Vila AJ, et al, Sensitive EDTA-based microbiological assays for detection of metallo-{beta}-lactamases in nonfermentative gram-negative bacteria. J Clin Microbiol 2005;43:5648-52.

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